7940039 has 4 divisors (see below), whose sum is σ = 8109024. Its totient is φ = 7771056.

The previous prime is 7940021. The next prime is 7940047. The reversal of 7940039 is 9300497.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7940039 - 2⁸ = 7939783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7939987 and 7940014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7940069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84422 + ... + 84515.

It is an arithmetic number, because the mean of its divisors is an integer number (2027256).

Almost surely, 2^7940039 is an apocalyptic number.

7940039 is a deficient number, since it is larger than the sum of its proper divisors (168985).

7940039 is a wasteful number, since it uses less digits than its factorization.

7940039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168984.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 7940039 is about 2817.8074810036. The cubic root of 7940039 is about 199.4990714002.

The spelling of 7940039 in words is "seven million, nine hundred forty thousand, thirty-nine".